The Proton Vest Black is a sleeveless jacket from Arc'Teryx that will be ideal as a second layer for all your mountain activities, from climbing to hiking, mountaineering or trail running.

Updated this season with new Octa® Loft insulation, it offers an ideal balance between ventilation and insulation, to let your body breathe during your intense activities while effectively protecting you from the cold. Stretchy, its Fortius™ Air 20 softshell outer material is both breathable and windproof, while its insulation will help you retain your body heat and retain its loft power season after season. The cut of the Proton Vest Black is preformed and adjusted to follow you in all your movements. Finally, the new chest pocket of the Proton Vest Black can accommodate a radio while its two hand pockets have a zip closure to keep your small items safe. An Arc'Teryx second layer ideal for wearing over thermal base layers and under a hardshell jacket in bad weather conditions.

• Sleeveless jacket.
• Breathable.
• Windbreaker.
• Adjusted and preformed cut.
• Breathable Octa® Loft insulation.
• Outer fabric in Fortius™ Air 20.
• Two zippered handwarmer pockets.
• Expandable zippered chest pocket that can accommodate a radio.
• Materials.
• Breathable Octa™ Loft insulation – 100% polyester.
• Fortius™ Air 20 - 84% Nylon, 16% Elastane.